Error shown after updating Microsoft .NET framework

Hi,
I have been using Microsoft .NET framework and I updated it recently.
It was updated successfully, but now, when I start the application, I get the first error shown below:

Unhandled exception has occurred in your application. If you click Continue, the application will ignore this error and attempt to continue. If you click Quit, the application will close immediately.
What should I do to get rid of the problem?
Your helpful suggestions are required please.
Thanks.
